roll: pigweed, pw_toolchain: pw_transfer: Add return values to handler registrations

Transfer handler registration/deregistration may not always complete due
to the event queue being blocked. Adding return status booleans to
provide that information of failure back to the caller.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/230912

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 821e313b4756e1d..6b35efa2be88764
Roller-URL: https://ci.chromium.org/b/8739047278890694545
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9e7a6b97d1d412f8f6bb38a145f2b6d123534906
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/showcase/sense/+/230935
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index 376732b..539fd30 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -48,8 +48,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-08-20.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8739051093813627025.
-    commit = "821e313b4756e1d35e07883da4127d26f5bebc50",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8739047278890694545.
+    commit = "6b35efa2be88764e09ed9de2dde754e35cb13360",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -57,8 +57,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-08-20.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8739051093813627025.
-    commit = "821e313b4756e1d35e07883da4127d26f5bebc50",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8739047278890694545.
+    commit = "6b35efa2be88764e09ed9de2dde754e35cb13360",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )